Oracle Team USA and Emirates Team New Zealand get close to each other at the start of Race 17 of the America's Cup Finals on Tuesday, September 24, 2013 in San Francisco, Calif.

Oracle Team USA and Emirates Team New Zealand get close to each other at the start of Race 17 of the America's Cup Finals on Tuesday, September 24, 2013 in San Francisco, Calif.

Photo: Beck Diefenbach, Special To The Chronicle

Oracle Team USA and Emirates Team New Zealand get close to each... Photo-5231764.70779 - GreenwichTime

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Oracle Team USA rounds mark 4 and heads to the finish line in race 18 over Emirates Team New Zealand to take race 18 and tie the score at 8-8 as the America's Cup continues on San Francisco Bay, Calif., on Tuesday Sept. 24, 2013. less

Oracle Team USA rounds mark 4 and heads to the finish line in race 18 over Emirates Team New Zealand to take race 18 and tie the score at 8-8 as the America's Cup continues on San Francisco Bay, Calif., on ... more

Photo: Michael Macor, The Chronicle

Oracle Team USA rounds mark 4 and heads to the finish line in race... Photo-5231765.70779 - GreenwichTime

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Taboola Gallery Frame Item-85307.70779 - GreenwichTime

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Oracle Team USA's AC72 passes by the America's Cup Park before the start of race 17 of the America's Cup Finals in San Francisco, CA Tuesday September 24, 2013.

Oracle Team USA's AC72 passes by the America's Cup Park before the start of race 17 of the America's Cup Finals in San Francisco, CA Tuesday September 24, 2013.

Emirates Team New Zealand, left, and Oracle Team USA pass each other as they make the turn at the leeward marks during race number 18 of the America's Cup Finals in San Francisco, CA Tuesday September 24, 2013. Oracle would eventually catch and pass Emirates to win race 18 to tie the series and force a winner-take-all race scheduled for Wednesday. less

Emirates Team New Zealand, left, and Oracle Team USA pass each other as they make the turn at the leeward marks during race number 18 of the America's Cup Finals in San Francisco, CA Tuesday September 24, 2013. ... more

Oracle Team USA, right, catches up to Emirates Team New Zealand as the to teams head up wind during race 18 of the America's Cup Finals in San Francisco, CA Tuesday September 24, 2013.

Oracle Team USA, right, catches up to Emirates Team New Zealand as the to teams head up wind during race 18 of the America's Cup Finals in San Francisco, CA Tuesday September 24, 2013.

Photo: Michael Short, The Chronicle

Oracle Team USA, right, catches up to Emirates Team New Zealand as... Photo-5231768.70779 - GreenwichTime

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A hawk glides over Treasure Island as Oracle Team USA and Emirates Team New Zealand head for the starting line in race 17 as the America's Cup continues on San Francisco Bay, Calif., on Tuesday Sept. 24, 2013.

A hawk glides over Treasure Island as Oracle Team USA and Emirates Team New Zealand head for the starting line in race 17 as the America's Cup continues on San Francisco Bay, Calif., on Tuesday Sept. 24, 2013.

Photo: Michael Macor, The Chronicle

A hawk glides over Treasure Island as Oracle Team USA and Emirates... Photo-5231769.70779 - GreenwichTime

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Taboola Gallery Frame Item-85307.70779 - GreenwichTime

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Oracle CEO Larry Ellison, center right, gestures after Oracle Team USA won the 18th race of the America's Cup sailing event against Emirates Team New Zealand.

Oracle CEO Larry Ellison, center right, gestures after Oracle Team USA won the 18th race of the America's Cup sailing event against Emirates Team New Zealand.

Chuck Anderson, left, of Australia and Aaron Toresen of New Zealand are seen dressed in American flag body suits in support of Oracle Team USA before the start of race 17 of the America's Cup Finals in San Francisco, CA Tuesday September 24, 2013. less

Chuck Anderson, left, of Australia and Aaron Toresen of New Zealand are seen dressed in American flag body suits in support of Oracle Team USA before the start of race 17 of the America's Cup Finals in San ... more

before the start of race 17 of the America's Cup Finals in San Francisco, CA Tuesday September 24, 2013.

before the start of race 17 of the America's Cup Finals in San Francisco, CA Tuesday September 24, 2013.

Photo: Michael Short, The Chronicle

before the start of race 17 of the America's Cup Finals in San... Photo-5231775.70779 - GreenwichTime

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Oracle Team USA heads upwind after rounding mark 2 in race 18 ahead of Emirates Team New Zealand as the America's Cup continues on San Francisco Bay, Calif., on Tuesday Sept. 24, 2013, with USA going on to win and tie the score at 8-8. less

Oracle Team USA heads upwind after rounding mark 2 in race 18 ahead of Emirates Team New Zealand as the America's Cup continues on San Francisco Bay, Calif., on Tuesday Sept. 24, 2013, with USA going on to win ... more

Oracle Team USA glides past America's Cup Park after winning race 18 over Emirates Team New Zealand to tie the score at 8-8 as the America's Cup continues on San Francisco Bay, Calif., on Tuesday Sept. 24, 2013. less

Oracle Team USA glides past America's Cup Park after winning race 18 over Emirates Team New Zealand to tie the score at 8-8 as the America's Cup continues on San Francisco Bay, Calif., on Tuesday Sept. 24, ... more

Oracle Team USA members Sir Ben Ainslie (R) and James Spithill walks onto the stage for dock-out show before going out to race against Emirates Team New Zealand in race 17 of the America's Cup Finals on September 24, 2013 in San Francisco. less

Oracle Team USA members Sir Ben Ainslie (R) and James Spithill walks onto the stage for dock-out show before going out to race against Emirates Team New Zealand in race 17 of the America's Cup Finals on ... more